Roof drilling and bolting apparatus having an operator carrying and protective device

ABSTRACT

An operator protective device for operator controlled apparatus, the protective device including a platform upon which an operator may be situated and a canopy extending over at least a portion of the platform and having at least an overhanging portion thereof spaced from the platform to provide a protective cover over an operator situated on the platform. Means is provided to selectively increase and decrease the relative spaced apart distance between the platform and the portion of the canopy which extends thereover, which means may also include means for movement of both the platform and the canopy as a unit with respect to the apparatus while maintaining a fixed relative spaced apart distance between the platform and the portion of the canopy which extends thereover.

United States Patent [1 1 Long Oct. 30, 1973 1 1 ROOF DRILLING AND BOLTING APPARATUS HAVING AN OPERATOR CARRYING AND PROTECTIVE DEVICE [75] Inventor: John B. Long, Oak Hill, W. Va.

[73] Assignee: The Marmon Group, Inc.,

Chicago, Ill.

[22] Filed: Sept. 8, 1972 [2]] Appl. No.: 287,404

Related U.S. Application Data [62] Division of Ser. No. 129,337, March 30, 1971.

Primary ExaminerErnest R. Purser Attorney-Browne, Beveridge, DeGrandi & Kline [5 7] ABSTRACT An operator protective device for operator controlled apparatus, the protective device including a platform upon which an operator may be situated and a canopy extending over at least a portion of the platform and having at least an overhanging portion thereof spaced from the platform to provide a protective cover over an operator situated on the platform. Means is provided to selectively increase and decrease the relative spaced apart distance between the platform and the portion of the canopy which extends thereover, which means may also include means for movement of both the platform and the canopy as a unit with respect to the apparatus while maintaining a fixed relative spaced apart distance between the platform and the portion of the canopy which extends thereover.

' 10 Claims, 17 Drawing Figures PATENTED GET 3 0 i975 sum 1 or 7 PAIENTEDUET 30 ms 3. 768.574

sum 5 or 7 FIG. l4

FIG. l5

ROOF DRILLING AND BOLTING APPARATUS HAVING AN OPERATOR CARRYING AND PROTECTIVE DEVICE This application is a division of my co-pending application, Ser. No. 129,337, filed Mar. 30, 1971.

This invention relates to improvements in an operator carrying and protective device for operator controlled aparatus.

The invention was primarily developed in connection with a mine roof drilling and bolting machine and it is thus shown and described herein. However, it will be readily appreciated that my improved operator carrying and protective device may be used with equal facility in connection with various other types of mining apparatus and with various apparatus used in above ground installations. The description of my improved operator carrying and protective device in association with a mine roof drilling and bolting machine is thus to be understood as by way of example and not as a limit to the scope of invention.

Mine roof drilling and bolting is one of the most dangerous jobs in a mine. It has been found that most injuries usually occur within to feet of the mine face, an area in which roof bolts have not yet been placed, which suggests that the high rate of injury in this area is due at least in part 'to the fact that the roof bolts are not in. When the roof is drilled for insertion of the roof bolts there is a further disturbing of the strata, which increases the likelihood of roof falls. It can thus be readily appreciated that the matter of protection for operators of mine roof drilling and bolting machines is a prime starting point for increasing miners safety. The primary object of the present invention is thus to provide an operator protective device which will decrease the likelihood of injury to an operator from falling objects. v

A further object is the provision of an operator carrying and protective device which includes a platform upon which the operator may be situated and a canopy extending over at least a portionof the platform, either the platform or the canopy, or both, being movable to selectively increase and decrease the relative spaced apart distance between the platform and the canopy. In use in connection with mine roof drilling and bolting machines, for instance, the platform could be moved against the floor to stabilize the machine and the canopy could be moved against the roof, to inhibit roof falls. In this connection, the means operative to hold the canopy against the roof is preferably provided with some relief means to yield and permit the canopy to yield and move away from the roof under'conditions of extreme overload, the canopy also preferably being shaped to provide a deflector portion for deflecting roof falls. This yielding action protects the operator by giving him visual evidence of roof failure while at the same time inducing the roof breakage to be deflected away from the operator.

Since the canopy is movable to positions of abutment with the roof it may also be used to hold objects against the roof. For instance in positioning an elongated tieplate whileperforming the necessary drilling and bolting operation for permanent attachment of the tie-plate I to the roof.

on a mine roof drilling and bolting machine in a thin seam mine. In such a situation, the mine roof and mine floor are usually somewhat undulating so that tramming of apparatus therein may be likely to provide some points at which the operator is imperiled by the machine he is riding not being able to vertically articulate to a degree to permit sufficient head room for the operator. I thus preferably provide that my improved operator carrying and protective device may be articulatively interconnected to operator control apparatus in a manner so that, for instance, in use of a platform and canopy for the protective device, the platform and canopy can be moved as a unit with respect to the frame of the apparatus to which it is interconnected, while maintaining a fixed relative spaced apart distance between the platform and the canopy.

As is shown herein, my improved operator carrying and protective device may be used in association with an improved drilling and bolting machine, which such roof drilling and bolting machine may include a pair of drilling and bolting means which extend outwardly from the machine at the same end thereof, an operator station being provided centrally between the drilling and bolting means. The operator may thus be located in a position for more convenient operation of the machine.

The drilling and bolting heads of my improved drilling and bolting machine are movable on vertical axes that are horizontally spaced apart a fixed distance, which distance may be the nominal distance according to the design of spacing of a pair of drilling and bolting places. The operator can thus, for instance, begin bolting operation on one of the drilling and bolting heads while the other drilling and bolting head is still in the act of drilling. This is a considerable safety factor in permitting an operator to increase his speed in setting up roof bolts, which enables him to substantially keep up with a continuous miner, which means that the roof bolting can be maintained closer to the face, thus decreasing the area adjacent the mine face which is subject to roof falls for lack of roof bolts.

Other objects and advantages will become apparent during the course of the following detailed description, taken in connection with the accompanying drawings, and in which drawings:

FIG. 1 is a perspective view of an end of a mine roof drilling and bolting machine which includes my improved operator carrying and protective device.

FIG. 2 is a perspective view of one side of the apparatus of FIG. 1.

FIG. 3 is a top plan view of a mine roof drilling and bolting machine which may include my improved operator carrying and protective device.

FIG.-4 is a longitudinal sectional view taken substantially on the line 4-4 of FIG. 3.

FIGS. 5, 6, and 7 are enlarged longitudinal sectional views taken substantially along the line 5-5 of FIG. 3

and showing various operating positionsof the drilling FIG. 17 is a schematic of the hydraulic circuitry relating to the canopy means and platform means of my operator carrying and protective device, which has been removed from the circuitry of FIG. 16, for more thorough understanding.

1n the drawing, wherein for the purpose ofillustration is shown a preferred embodiment of the invention, and wherein similar reference characters may designate corresponding parts throughout the several views, the letter A may designate a drilling and bolting machine upon which may be provided my improved operator carrying and protective device B.

Drilling and bolting machine A preferably includes a main frame 20 that may be suitably mounted on wheels 21 for mobility. The basic elements of the electrical system of the drilling and bolting machine may be mounted on main frame 20, including an electric motor 23 that is suitably interconnected to a starter 24, and electric cable 25 being provided to supply power to the electrical system. Drilling and bolting machine A may usually be moved about quite a distance from an electrical source and I therefore preferably provide a cable wheel 26 for carrying a large supply of cable 25, a cable guide 27 being provided to guide cable 25 as it is wound and unwound with respect to cable wheel 26. Electric motor 23 is interconnected to drive hydraulic pumps 30 and 31 which supply hydraulic fluid through the hydraulic system, basic portions of which may likewise be mounted on main frame 20. These may include a hydraulic fluid tank 35; a plurality of valve banks 36, 37 and 38; tram units 40 which may be suitably interconnected by drive chains 41 to provide power to wheels 21; a hydraulic motor 45 for driving cable reel 26; and a hydraulic motor 47 for driving blowers 48 and 49 for collection of dust during the drilling opera tion through dust conveying hoses 50 which lead to dust collector boxes 51 and 52. Dust collector boxes 51 and 52 are preferably positioned for ready access by the operator in emptying the same.

A cover or deck 54 may be mounted on frame 20 for providing a convenient place upon which to carry parts and equipment which may be used in the drilling and bolting operation, such as roof bolts and tie-plates.

Mounted on one end of main frame 20 may be a pair of drilling and bolting means 55 and 56. Drilling and bolting means 55 and 56 preferably extend divergently outwardly from main frame 20 and provide an intermediate space therebetween which may define an operator and control position.

Each drilling and bolting means 55 and 56 may be of conventional construction. They may, for instance, each include inner and outer side frames 60 and 61 which are welded or otherwise suitably secured to main frame 20 for support of drilling and bolting means 55 and 56 in a substantially horizontally fixed spaced apart position with respect to each other and with the drilling and bolting heads 63 thereof spaced apart a nominal distance according to the design spacing of a pair of drilling and bolting places. Drilling and bolting heads 63 may be driven by hydraulic motors 64 which are suitably connected to the hydraulic system of the machine, as will be subsequently described. Drilling and bolting heads 63 are preferably of the type to provide through the stem dust collection during the drilling operation and are suitably interconnected to a dust conveying hose 50 which collects dust and conveys the same to a dust collector box 51 or 52, as is well known in the art.

An auger guide assembly 66 may be mounted on outer side frame 61 for guiding the auger as the drilling and bolting head 63 is raised from its lowermost position as shown in FIG. 6.

Suitable guide means 67 is provided for straight line movement of drilling and bolting head 63.

Guide means 67 may include a carriage 68 that may be slidably supported between runner bars or rails 69 and 70 mounted on side frames 60 and 61. A pair of spaced apart guide arm means 72 and 73 are provided, the same being pivotally interconnected at one end thereof to drilling and bolting head 63 and pivotally interconnected at the other end thereof to carriage 68. A pair of guide links 74 and 75 are provided, one being pivotally interconnected to each guide arm means 72, guide link 74 being pivotally interconnected at the other end thereof to side frame 60 and guide link 75 being pivotally interconnected at the other end thereof to guide frame 61. A hydraulic cylinder 76 is provided, the same being pivotally interconnected at one end thereof to carriage 68 and at the other end thereof to guide arm 72, the same providing lift means for raising and lowering of drilling and bolting head 63 through its various positions, as is well known in the art, and as is shown in FIGS. 5, 6 and 7.

Transverse cross members 77 may be provided to extend between the outermost ends of drilling and bolting means 55 and 56, providing a main control panel mount which will be subsequently described. The facing sides of inner side frames 60 of each drilling and bolting means 55 and 56 may be provided with a substantially horizontally extending flange member 79 for a purpose as will be subsequently described.

Operator carrying and protective device B preferably includes platform or stabilizer means 80 and canopy means 81.

Platform means 80 preferably includes an elongated frame portion 83 which is pivotally supported adjacent one end thereof between side frames 60 such as by pivot means 84 which provides support means for vertical pivotal movement thereof within the operator and control position defined between drilling and bolting means 55 and 56. The other end of frame 83 may be provided with an enlarged support portion 85 on which an operator may be situated. A pair of hydraulic cylinders 86 provide power means for raising and lowering platform means 80. Hydraulic cylinders 86 may be pivotally attached at one end thereof to frame 83 of platform means 80 and at the other end thereof to a flange member 79 of a side frame 60 of each drilling and bolting means 55 and 56.

Canopy means 81 preferably includes an elongated frame 88 which may be pivotally supported adjacent one end thereof such as by pivot means 89. Pivot means '89 provides support means for mounting of canopy means 81 on main frame 20. Hydraulic cylinder 90 provides power means for vertical raising and lowering of canopy means'81. Hydraulic cylinder 90 may be pivotally interconnected at one end thereof to elongated frame 88 of canopy means 81 and at the other end thereof to elongated frame 83 of platform means 80. Elongated frame 88 may be provided at the outermost end thereof with an arcuately curved portion 92 which overhangs the enlarged support portion 85 of platform means 80 and provides a deflector portion for deflecting roof falls.

FIGS. 8-15 are illustrative of positioning of platform means 80 and canopy means 81, the same being selectively movable to increase and decrease the relative spaced apart distance therebetween and also being movable as a unit with respect to drilling and bolting machine A.

FIG. 8 shows the minimal spacing between platform means 80 and canopy means 81, canopy means 81 being lowered to its lowermost position and platform means 80 being raised to its uppermost position. Such minimum opening between the respective elements provides adequate seating height for an operator.

FIG. 9 illustrates maximum spacing between platform means 80 and canopy means 81, canopy means 81 being raised to its uppermost position and platform means 80 being in its lowermost position. The maximum opening between platform means 80 and canopy means 81 accommodates greater seam heights.

FIGS. 10 and 11 are illustrative of the maintenace of a constant spaced apart relationship between platform means 80 and canopy means 81 in respective raised and lowered positions. This shows that the relative relationship between canopy means 81 and platform means 80 may be kept constant while both elements can be varied with respect to both drilling and bolting machine A and/or the ground floor.

FIG. 12 shows the normal stationary position. That is, with platform means 80 in contact with the ground, providing a stabilizing effect for the machine and with canopy means 81 in contact with the roof, thereby simultaneously providing overhead protection and roof support. When in this position, canopy means 81 might be used to hold an object such as a tie-plate against the roof, while performing the necessary drilling and bolting operation for permanent attachment of the same to the roof. In this position, in the event two men may be working the machine, both may crouch beneath canopy means 81, at least protecting their heads and upper torso even though neither may be situated on platform means 80.

FIG. 13 showsrelative positioning of platform means 80 and canopy means 81 for relatively even seam conditions. In this condition, platform means 80 is raised just above the ground and canopy means 81 is lowered just below the roof, allowing maximum operators seating height convenience, overhead protection, and machine stability.

FIGS. 14 and 15 are illustrative of tramming in undulating seam conditions. This is, by simultaneously depressing or raising both platform means 80 and canopy means 81 the machine may be maneuvered through a roll in the seam.

The overall hydraulic system is diagrammatically shown in FIG. 16. As is conventional in diagrammatic showings of such hydraulic systems, some of the return lines are shown as having return flow to a sump 35'. This is a convenience in the diagrammatic showing rather than having the return lines run all of the way back to oil tank 35 which they do in the actual machine.

Taking the left hand drill and tram circuit first:

Line 100 leads from tank 35 through pump-30 to tee manifold 101. Fluid flow then may travel from tee manifold 101 through line 107 to valve bank inlet 36 or through line 102 through flow regulator 103 to return manifold 104, depending upon the manual adjustment of flow regulator 103. Gauge 108 may be provided for showing pressure supplied to valve bank 36. In operation of valve section 109 of valve bank 36, pulling out lever 110 will permit flow through line 111 through cross line relief valve 112 and check valve 113 to drill motor 64. Pushing in lever 110 will provide flow through line 114, relief valve 112, and check valve 115 to drill motor 64.

In operation of valve section 119 of valve bank 36, movement of lever 120 provides for flow through either lines 121 and 122 for movement of tram motor 40 in one direction or the other, for tramming in forward and in reverse. Line 123 is provided for return of fluid to tank 35 from valve bank 36 through manifold 104.

The hydraulic system used in connection with the right hand drilling and tramming operation, through right hand valve bank 38, is identical to that previously described in connection with the left hand side and identical reference characters with a prime character have been applied to corresponding parts of the right hand side.

Both pumps 30 and 31 are used to provide hydraulic fluid to center valve bank 37. They may each withdraw fluid from hydraulic tank 35 through a line 130, flow from pump 30 being through line 131 to flow dividercombiner 132 and through respective lines 133 and 134 to different parts of valve bank 37. Flow from pump 31 is through line 135 to another part of valve bank 37. Gauges 136, 137 and 138 may be provided for showing the fluid pressure in respective parts of valve bank 37. Line 140 may be provided leading from valve bank 37, through manifold 141, through return line 142 and filter 143 to return fluid to tank 35.

In operation of valve section 147 of valve bank 37, pushing in lever 150 provides flow through line 151 and regulator 152 to cylinder 76 for raising drilling and bolting means 55, fluid exhausting from the opposite end of cylinder 76 through line 153 and valve bank 37 to line 140 and return manifold 141. Pulling out lever 150 provides flow'through line 153 and reverse flow through line 151 to lower drilling and bolting means 55.

Operation of valve section 156 of valve bank 37 by lever 157 provides for control of hydraulic cylinder 76 for raising and lowering of drilling and bolting means 56. Hydraulic circuitry in connection therewith is identical to that previously described in connection with drilling and bolting means 55 and identical reference characters, with a prime character, have been applied to corresponding parts of this hydraulic circuit.

Valve section 158 is provided for control of both cable reel motor 45 and blower'47. This relationship is permitted in view of the fact that these two motors will not be normally operated at the same time. When lever 159 is pushed in, flow will be provided through line 160 to blower motor 47 and through line 161 to return manifold 141. When lever 159 is pulled out, fluid flow will be provided through line 165, to reel motor 45, and through line 166 to sump 35'. These controls are such that when reel motor 45 is running blower motor 47 is in neutral and when blower motor 47 is running reel motor 45 is in neutral.

In operation of valve section 167 of valve bank 37, pushing in lever 168 provides for fluid flow through line 170 to hydraulic cylinder 90 for raising canopy means 81, fluid exhausting from the opposite end of cylinder 90 through line 171 to line 140 and return manifold 141. Pulling out lever 168 provides flow through line 171 and reverse flow through line 170 to lower canopy means 81. Valve section 167 is preferably provided with a pressure relief valve which permits cylinder 90 to yield in cases of extreme roof overloads.

In operation of valve section 174 of valve bank 37, pushing in lever 175 provides for flow through line 178 to hydraulic cylinders 86, fluid exhausting from the opposite ends of cylinders 86 through line 179 to line 140 and return manifold 141, which lowers platform means 80. Pulling out lever 175 provides flow through line 179 and reverse flow through line 178 to raise platform means 80. V

The respective operating handles are preferably mounted on transverse frame members 77 in a central operator control position. At this position is also preferably provided a push button switch control station 180 for starting and stopping electric motor 23. An auxiliary operator control position may also be provided on the right hand side of the machine, which po sition may include an auxiliary push button control sta tion 181 for starting and stopping motor 23 and tram levers 120 and 120" for respective operation of the left and right hand tram units 40.

In order that the hydraulic circuitry in connection with operation of platform means 80 and canopy means 81 may be clearly understood, and since the same may form a part of either an independent circuit or one which is not associated with a drilling and bolting machine, the same is shown separately in FIG. 17. The same reference characters have been applied to the parts as shown in FIG. 17 as were applied in connection with the showing of FIG. 16.

In normal operation the operator positions himself, on the stabilizer platform between drilling and bolting means 55 and 56. A complete set of conveniently located control handles are thus situated immediately in front of the operator, as shown in FIG. 1.

The canopy and platform control levers are preferably located side-by-side for east of simultaneous operation of both functions. Note that pushing both levers in will respectively set both the canopy and the platform against the roof and bottom. Pulling both levers out simultaneously-will retract both the canopy and stabilizer into their normal tramming positions. During both of these operations the operator is situated snugly between platform means 80 and canopy means 81, avoiding any exposure to the hazards of roof falls. During his entire drilling and placing of bolts he is constantly protected from roof debris by overhead canopy means 81.

The attachment of canopy hydraulic cylinder 90 to platform means 80 enables canopy means 81 to move up and down as platfrom means 80 is raised and lowered for maintaining a fixed relationship between these two elements. This is particularly valuable when tramming in low roof conditions. Platform means 80 can then be lowered near the bottom, which also lowers canopy means 81 away from the floor, allowing the machine to pass through.

OPERATION Drilling and bolting machine A is trammed into place and positioned in the desired location for the first two bolts. Platform means 80 and canopy means 81 are set simultaneously by pulling out levers 175 and 168. When platform means 80 has picked up an appropriate amount of the machine weight and canopy means 81 is secured against the roof, the control levers are released, being spring centered so that they will return to their neutral position. Drill head 63 ofleft hand drilling and bolting means 55 is lowered to its bottom position by pulling out lever 150. Just before the drill head contacts the mine floor, the lever should be returned to its central position to prevent impacting the bottom of drill head 63 against the mine floor.

The blowers 48 and 49 are started by pushing in lever 159, which starts motor 47 that operates blowers 48 and 49 Auger guide assembly 66 of drilling and bolting means 55 is set into operating position and the drill steel (not shown) which may be carried on a conveniently located rack 185 is inserted into the chuck of drill head 63 and positioned in auger guide assembly 66. The drill steel is then raised by pushing in drill lever 150 until the bit contacts the mine roof and lever 150 is then returned to neutral. The next operation involves a rapid sequence of lever operations. While steadying the drill steel with his left hand, the operator pushes in left drill motor lever and locks the same at the appropriate drill speed. Lever is also locked for correct lift. The left hand drill is now drilling and feeding under its preset controls. Both the speed of the drill motor and the speed of the lift should be selected to obtain the optimum drilling rate without stalling so that the entire drilling function can be performed by the machine without the operators constant attention.

While the operator leaves the left hand drill performing its drilling function, be can lower right hand drilling and bolting means 56 to the bottom by pulling out lift lever 157. The same precautions and control actions are utilized in connection with right hand drilling and bolting means 56 as were used on the left. The right hand drill motor 64 is started by pressing the lever 109 as was the case with left hand drill motor. All other functions for the right hand drill arc sequenced and performed in the same manner as they were in connection with the left hand drill.

Now we have both drills going simultaneously with the left hand drill ready to be stopped while the right hand drill continues its drilling function. Just before the chuck of the left drill head contacts the roof, the left drill lift is stopped by pulling lever 150 into its neutral position. Immediately after stopping the lift, the operator should stop the drill motor by pulling lever 109 into its neutral position. With the hole drilled to the desired depth, the drill is then lowered, the drill steel (not shown) is removed and placed back in a storage rack and a spring mounted bolting chuck (not shown) placed on the drill head for transmission. Generally, by the time the left hand bolt is ready for installation, the right hand drill has completed its hole and should be shut off in the same manner as was the left hand drill. Roof bolts should be made up in advance and placed in their storage tray ready for installation. The made up roof bolt is started into the hole and the head of the bolt placed in the bolting chuck. The left hand lift 76 is then engaged, raising the bolt in position with its plate flat against the roof, and the lever left in to hold the bolt in place. The bolt is ready for torquing and the drill motor lever 109 is then pulled out. In this position the drill motor is automatically regulated to the amount of its output torque by its separately adjusted relief valve 112 and will tighten the bolt to its optimum tensioning ability (approximately 200 foot pounds). When the drill motor has run the bolt up tight and reached the stalled condition, its lever is returned to neutral and the drill head is lowered into its normal tramming position. The

right hand drill is now ready for disengagement of the drill steel and subsequent bolt installation. These functions are performed in exactly the same sequence and manner as previously described for the left hand side.

REPOSITIONING With both drill heads in their neutral tramming positions, stabilizer and canopy controls 175 and 168 are pulled out until platform means 80 and canopy means 81 are retracted into their notmal tramming positions. Releasing these levers to return to their spring centered neutral positions, the operator is free to tram the machine into its next position. Tram levers 120 and 120 are pushed or pulled in the direction the operator wishes the machine to travel. Reverse shifting of either lever will produce crawl or steering action about the machines own center in the same direction as the le vers are shifted, giving a natural steering reaction to the input lever action.

Various changes in the shape, size and arrangement of parts herein shown and described may be made without departing from the spirit of the invention or the scope of the following claims.

I claim: I

1. In a roof drilling and bolting machine of the type nromally operative in relatively confined places having a ground floor and a roof, such as mine passageways and the like, the combination of a main frame, a pair of drilling and bolting means mounted on said main frame and extending outwardly from one end thereof, means mounted on said main frame and operatively connected to said drilling and bolting means for operation thereof, said drilling and bolting means being horizontally spaced apart in a relatively fixed position with respect to each other to define an intermediate space providing an operator and control position therebetween and having drilling and bolting heads spaced apart a nominal distance according to the design spacing of a pair of drilling and bolting places, and operator station means provided substantially intermediate said' pair of drilling and bolting means in the operator and control position therebetween, said operator station means including an operator carrying protective device, said operator carrying protective device including platform means upon which an operator may be situated and canopy means extending over at least a portion of said platform means and having at least an overhanging portion thereof spaced apart from said platform means to provide a protective cover over an operator situated on said platform means, support means for mounting of said platform means and said canopy means on said main frame of said machine, and means for movement of both said platform means and said canopy means relative to said main frame of said machine and to each other to selectively increase and decrease the relative spaced apart distance between said platform means and said portion of said canopy means which extends thereover and is spaced apart therefrom, said last mentioned means including means for selectively moving said platform means into abutment with a ground floor and said canopy means into abutment with the roof of the confined place being worked.

2. A roof drilling and bolting machine as specified in claim 1 including tram means mounted on said main frame for tramming of said machine from one position to another, said means for movement of both said platform means and said canopy means relative to said frame of said machine and to each other including means for movement of said platform means and said canopy means as aunit with respect to said main frame for maintaining a fixed relative spaced apart distance between said platform means and said portion of said canopy means which extends thereover and is spaced apart therefrom.

3. A roof drilling and bolting machine as specified in claim 1 wherein said platform means includes an elongated frame which extends substantially intermediate said pair of drilling and bolting means andis provided adjacent the end thereof adjacent the outermost reaches of said drilling and bolting means with an operator receiving portion upon which an operator may be situated and is provided adjacent the other end thereof with pivot means, said pivot means comprising said support means for mounting of said platform means on said main frame and providing a pivotal interconnection for said platform means to said main frame for vertical pivotal movement of said platform means intermediate the said drilling and bolting means, and said canopy means includes an elongated frame extending substantially intermediate said drilling and bolting means and provided adjacent the end thereof adjacent the outermost reaches of said drilling and bolting means with a cover portion extending over and in a spaced apart position with respect to at least a portion of said operator receiving portion of said platform means and is provided adjacent the other end'thereof with pivot means which comprises said support means for mounting of said canopy means on said main frame, said last mentioned pivot means interconnecting said canopy means to said main frame for vertical pivotal movement of said canopy means with respect to said platform means and intermediate said drilling and bolting means.

4. A roof drilling and bolting machine as specified in claim 3 wherein said means for movement of both said platform means and said canopy means relative to each other and to said main frame of said machine includes a first means operatively interconnected between said main frame and said platform means for relative movement of said platform means with respect to said main frame and means operatively interconnected between said platform means and said canopy means for relative movement of said canopy means with respect to said platform means. I 5. The combination as specified in claim 4 wherein said last mentioned means includes relief overload means to permit said canopy means to yield under conditions of extreme roof overload and said canopy means includes a deflector portion for deflecting roof falls. V l

6. In a roof drilling and bolting machine of the type normally operative in relatively confined places having a ground floor and a roof, such as mine passageways and the line, the combination of a main frame, a pair of drilling and bolting means mounted on said main frame and extending outwardly from one end thereof, means mounted on said main frame and operatively connected to said drilling and bolting means for operation thereof, said drilling and bolting means being horizontally spaced apart in a relatively fixed position with respect to each other to define an intermediate space providing an operator and control position therebetween and having drilling and bolting heads spaced apart a nominal distance according to the design spacing of a pair of drilling and bolting places, and operator station means provided substantially intermediate said pair of drilling and bolting means in the operator and control position therebetween, said operator station means including an operator protective device including canopy means having an overhanging cantilever portion extending over said operator and control posi' tion and support means for mounting said canopy means on said main frame with said overhanging cantilever portion extending as a cantilever over said operator and control position in a spaced-apart relation above said operator and control position to provide a protective cover over an operator situated at said operator and control position and means for selective movement of said canopy means to selectively increase and decrease the relative spaced-apart distance of said overhanging cantilever portion of said canopy means above said operator and control position.

7. The combination as specified in claim 6 wherein said last mentioned means includes means for movement of said canopy means into abutment with the roof of the confined place being worked and relief overload means to permit said canopy means to yield under conditions of extreme roof overload and said canopy means includes a deflector portion for deflecting roof falls.

8. The combination as specified in claim 6 wherein said operator station means includes platform means extending beyond said main frame to provide a platform upon which an operator may be situated at said operator and control position, and support means for mounting said platform means on said main frame, said overhanging cantilever portion of said canopy means extended in a spaced-apart relation over at least a portion of said platform means to provide a protective cover over an operator situated on said platform means, said support means for said canopy means and said platform means including means for selective movement of at least one said platform means and said canopy means with respect to the other to selectively increase and decrease the relative spaced-apart distance between said platform means and said overhanging cantilever portion of said canopy means which extends over said platform means and is spaced-apart therefrom.

9. The combination as specified in claim 8 wherein said means for selective movement of at least one said platform means and said canopy means includes means for movement of both said platform means and said canopy means as a unit with respect to said main frame while maintaining a fixed relative spaced-apart distance between said platform means and said overhanging cantilever portion of said canopy means which extends thereover and is spaced-apart therefrom.

10. The combination as specified in claim 8 wherein said means for selective movement of at least one said platform means and said canopy means includes means for movement of both said platform means and said canopy means as a unit with respect to said main frame while maintaining a fixed relative spaced-apart distance between said platform means and said overhanging cantilever portion of said canopy means which extends thereover and is spaced-apart therefrom. 

1. In a roof drilling and bolting machine of the type nromally operative in relatively confined places having a ground floor and a roof, such as mine passageways and the like, the combination of a main frame, a pair of drilling and bolting means mounted on said main frame and extending outwardly from one end thereof, means mounted on said main frame and operatively connected to said drilling and bolting means for operation thereof, said drilling and bolting means being horizontally spaced apart in a relatively fixed position with respect to each other to define an intermediate space providing an operator and control position therebetween and having drilling and bolting heads spaced apart a nominal distance according to the design spacing of a pair of drilling and bolting places, and operator station means provided substantially intermediate said pair of drilling and bolting means in the operator and control position therebetween, said operator station means including an operator carrying protective device, said operator carrying protective device including platform means upon which an operator may be situated and canopy means extending over at least a portion of said platform means and having at least an overhanging portion thereof spaced apart from said platform means to provide a protective cover over an operator situated on said platform means, support means for mounting of said platform means and said canopy means on said main frame of said machine, and means for movement of both said platform means and said canopy means relative to said main frame of said machine and to each other to selectively increase and decrease the relative spaced apart distance between said platform means and said portion of said canopy means which extends thereover and is spaced apart therefrom, said last mentioned means including means for selectively moving said platform means into abutment with a ground floor and said canopy means into abutment with the roof of the confined place being worked.
 2. A roof drilling and bolting machine as specified in claim 1 includiNg tram means mounted on said main frame for tramming of said machine from one position to another, said means for movement of both said platform means and said canopy means relative to said frame of said machine and to each other including means for movement of said platform means and said canopy means as a unit with respect to said main frame for maintaining a fixed relative spaced apart distance between said platform means and said portion of said canopy means which extends thereover and is spaced apart therefrom.
 3. A roof drilling and bolting machine as specified in claim 1 wherein said platform means includes an elongated frame which extends substantially intermediate said pair of drilling and bolting means and is provided adjacent the end thereof adjacent the outermost reaches of said drilling and bolting means with an operator receiving portion upon which an operator may be situated and is provided adjacent the other end thereof with pivot means, said pivot means comprising said support means for mounting of said platform means on said main frame and providing a pivotal interconnection for said platform means to said main frame for vertical pivotal movement of said platform means intermediate the said drilling and bolting means, and said canopy means includes an elongated frame extending substantially intermediate said drilling and bolting means and provided adjacent the end thereof adjacent the outermost reaches of said drilling and bolting means with a cover portion extending over and in a spaced apart position with respect to at least a portion of said operator receiving portion of said platform means and is provided adjacent the other end thereof with pivot means which comprises said support means for mounting of said canopy means on said main frame, said last mentioned pivot means interconnecting said canopy means to said main frame for vertical pivotal movement of said canopy means with respect to said platform means and intermediate said drilling and bolting means.
 4. A roof drilling and bolting machine as specified in claim 3 wherein said means for movement of both said platform means and said canopy means relative to each other and to said main frame of said machine includes a first means operatively interconnected between said main frame and said platform means for relative movement of said platform means with respect to said main frame and means operatively interconnected between said platform means and said canopy means for relative movement of said canopy means with respect to said platform means.
 5. The combination as specified in claim 4 wherein said last mentioned means includes relief overload means to permit said canopy means to yield under conditions of extreme roof overload and said canopy means includes a deflector portion for deflecting roof falls.
 6. In a roof drilling and bolting machine of the type normally operative in relatively confined places having a ground floor and a roof, such as mine passageways and the line, the combination of a main frame, a pair of drilling and bolting means mounted on said main frame and extending outwardly from one end thereof, means mounted on said main frame and operatively connected to said drilling and bolting means for operation thereof, said drilling and bolting means being horizontally spaced apart in a relatively fixed position with respect to each other to define an intermediate space providing an operator and control position therebetween and having drilling and bolting heads spaced apart a nominal distance according to the design spacing of a pair of drilling and bolting places, and operator station means provided substantially intermediate said pair of drilling and bolting means in the operator and control position therebetween, said operator station means including an operator protective device including canopy means having an overhanging cantilever portion extending over said operator and control position and support means for mounting said canopy means on said main frame with said overhanging cantilever portion extending as a cantilever over said operator and control position in a spaced-apart relation above said operator and control position to provide a protective cover over an operator situated at said operator and control position and means for selective movement of said canopy means to selectively increase and decrease the relative spaced-apart distance of said overhanging cantilever portion of said canopy means above said operator and control position.
 7. The combination as specified in claim 6 wherein said last mentioned means includes means for movement of said canopy means into abutment with the roof of the confined place being worked and relief overload means to permit said canopy means to yield under conditions of extreme roof overload and said canopy means includes a deflector portion for deflecting roof falls.
 8. The combination as specified in claim 6 wherein said operator station means includes platform means extending beyond said main frame to provide a platform upon which an operator may be situated at said operator and control position, and support means for mounting said platform means on said main frame, said overhanging cantilever portion of said canopy means extended in a spaced-apart relation over at least a portion of said platform means to provide a protective cover over an operator situated on said platform means, said support means for said canopy means and said platform means including means for selective movement of at least one said platform means and said canopy means with respect to the other to selectively increase and decrease the relative spaced-apart distance between said platform means and said overhanging cantilever portion of said canopy means which extends over said platform means and is spaced-apart therefrom.
 9. The combination as specified in claim 8 wherein said means for selective movement of at least one said platform means and said canopy means includes means for movement of both said platform means and said canopy means as a unit with respect to said main frame while maintaining a fixed relative spaced-apart distance between said platform means and said overhanging cantilever portion of said canopy means which extends thereover and is spaced-apart therefrom.
 10. The combination as specified in claim 8 wherein said means for selective movement of at least one said platform means and said canopy means includes means for movement of both said platform means and said canopy means as a unit with respect to said main frame while maintaining a fixed relative spaced-apart distance between said platform means and said overhanging cantilever portion of said canopy means which extends thereover and is spaced-apart therefrom. 